Andersen Severs Ties With CMS;
Energy Firm Hires Ernst & Young

DEARBORN, Mich. -- CMS Energy Corp. said former auditor Arthur Andersen LLP formally ended its relationship with the company and won't give an opinion on the energy firm's restated-financial results.

CMS, one of the country's largest investor-owned power and gas utilities, said last month it would restate its financial results for 2000 and 2001 to eliminate revenue and expenses from so-called round-trip trades. The practice involves...